What are the symptoms of PCOS? The symptoms of PCOS can vary from woman to woman. Some of the symptoms of PCOS include: Infertility (not able to get pregnant) because of not ovulating. In fact, PCOS is the most common cause of female infertility. Infrequent, absent, and/or irregular menstrual periods Hirsutism (HER-suh-tiz-um) — increased hair